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Slow light and localization in periodic waveguides: role of the effective photon mass

The propagation of slow light in periodic waveguides is prevented by tiny fabrication imperfections and localization. It is known the back-reflection is enhanced by the slowness, and that it is inversely proportional to the square of the group velocity. Researchers at LP2N have revealed and explained the importance of the effective photon mass (i.e. the second derivative of the dispersion curve) in the formation of localized modes in periodic waveguides.

More details in: R. Faggiani, A. Baron, X. Zang, L. Lalouat, S. A. Schulz, B. O'Regan, K. Vynck, B. Cluzel, F. de Fornel, T. F. Krauss, and P. Lalanne, "Lower bounds for the spatial extent of localized modes in photonic-crystal waveguides with small random imperfections", Sci. Rep. 6, 27037 (2016). (link)

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